in the blink of an eye
in the twinkling of an eye
right
instanter
insta-
right now
at a moment's notice
in the wink of an eye
in a flash
most Rikki-Tik
at one stroke
tatkal
instant
right off
straight out of the chute
immediate
presently
this instant
instantaneousness
instantaneity
at once
flash
tout de suite
on the nail
forthwith
instantiable
proximally
immediately
⠊⠍⠍
pseudoparticle
stat
at the drop of a hat
off the bat
this minute
off the rip
break into
out of the chute
instantial
slap-bang
autostart
in a snap
offhand
on the double
instantization
incontinent
nowish
erupt
break out
autosensing
simultaneously